Aquatics FAQs
Recommendations for Fully Vaccinated People
COVID-19 Homepage
COVID-19 Vaccines are Effective
CDC is reviewing this page to align with updated guidance.
![An illustrated image of two parents and a young child, all wearing masks, with the father holding a shield showing the word vaccine on the front.](/congress117th/20221028000618im_/https://www.cdc.gov/coronavirus/2019-ncov/vaccines/images/vaccines-work_1.png?_=21295)
- COVID-19 vaccines are safe and effective.
- COVID-19 vaccination helps protect adults and children ages 6 months and older from getting severely ill with COVID-19 and helps protect those around them.
- Some people who are vaccinated against COVID-19 will still get sick and have a vaccine breakthrough infection because no vaccine is 100% effective.
COVID-19 Vaccines Work
How and Why CDC Monitors Vaccine Effectiveness
![An illustrated image of two parents and a young child, all wearing masks, with the father holding a shield showing the word vaccine on the front.](/congress117th/20221028000618im_/https://www.cdc.gov/coronavirus/2019-ncov/vaccines/images/vaccines-work_1.png?_=21295)
Vaccine Effectiveness
Vaccine effectiveness is a measure of how well vaccination protects people against outcomes such as infection, symptomatic illness, hospitalization, and death. Vaccine effectiveness is typically measured through observational studies specifically designed to estimate individual protection from vaccination under “real-world” conditions.
Data on Vaccine Effectiveness and Vaccine Breakthrough Infections
As part of CDC’s ongoing efforts to understand how well COVID-19 vaccines are working, CDC is monitoring vaccine effectiveness and rates of breakthrough infections, hospitalizations, and deaths.